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Jennings, however, uses the chamber on a daily basis to keep his body more active.

He also exclusively eats food with no gluten or casein (a type of protein found in milk) prepared by his personal chef, and has never smoked or drunk alcohol.

Showing off the bag, Jennings told the New York Post: 'I use it to rejuvenate and energize.

'Even on a cognitive level it helps out... When you wake up, you feel the difference.'

Though he leaves it at home for away games, it is a must when he joins his fellow Giants at pre-season training camp.

His strict diet and health routine is a far cry to his childhood in Forest, Virginia.

In many cases, the treatment is used as a way to speed up muscle recovery after injury. Jennings, however, uses the chamber on a daily basis to keep his body more active. Pictured: a chamber in a Texas hospital

Always on the bench at school, he was overweight and had asthma.

He'd watch his classmates play, while drinking Sprite and eating M&Ms to pass the time.

According to Jennings, he was inspired to overhaul his lifestyle after he got a break in a game when another player got injured - and a University of Tennessee scout was watching.

He scored on a 40-yard run, followed quickly by three more touchdowns, two of them on defense. In 14 plays, he had four scores.

After the game, the scout came over and asked Jennings about his grades in school.

They were bad - but the scout told him: 'Son, you have potential.'

He hit the gym and overhauled his parents' kitchen.

'I’ve had to overcome a lot of giants in my life to actually become a Giant,' he told the Post.